Made for the outdoor enthusiast, this thermal underwear helps control moisture but keep you warm, and fits like a premium athletic shirt. Model: 58A Color: Black ThermaChoice® System – Cold to Very Cold Temperatures and Medium to High Activity Single-Layer Engineering ColdPruf Technical Fiber Polyester with SILVADUR™ Intelligent Freshness Controls odor and inhibits bacterial growth on fabric Wicks and aids in moisture evaporation 96% Performance polyester / 4% Spandex Self-fabric cuffs Athletic fit Tagless and Flat Seams for added comfort NOTE: Thermal Underwear cannot be returned once the package is opened, so please use the size guide to help find the right size for you.